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EARTHQUAKES

EARTHQUAKES. THE MOVERS AND SHAKERS. GROUND SHAKERS.

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EARTHQUAKES

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  1. EARTHQUAKES THE MOVERS AND SHAKERS

  2. GROUND SHAKERS • Earthquakes can be violent, destructive and difficult to predict. They occur along fault lines in the Earth’s crust. Faulting occurs when rock is strained beyond its ability to remain a solid unit, causing a build up of pressure that eventually causes the rocks of the crust to break apart. At the moment that rocks along a fault line shift, or plates move, the stored up energy is released causing the earth to vibrate and the ground to shake. • Earthquakes usually only last for a few seconds, most are often less than a minute long, but can cause devastating effects on people and their settlements.

  3. Ground shakers

  4. On the rebound • H. F. Reid came up with a theory of elastic rebound to explain how earthquakes occur. The Elastic Rebound Theory states that when rocks are deformed due to stress and strain from plate tectonic movement, they store energy and bend. When stressed beyond their limit, they suddenly break apart, releasing great amounts of energy in the form of an earthquake.

  5. On the rebound

  6. Cross section of an earthquake Draw and label the diagram below into your notes and include the description beside it.

  7. Task! • Read pages 54 to 59. • Answer Q. # 1.a, 2.a) and b), and 3 from p. 57 in full and complete sentences • Copy the Richter Scale chart from p. 58 into your notes • Answer Q. # 1 from p. 59 in a full and complete sentence • Answer Q. # 11, 12 and 13 from p. 61 in full and complete sentences *Any of the above not completed in class must be completed by Thursday’s class. Study for Quiz on Volcanoes tomorrow!

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